通过电离子工程改变氧-进化反应路径,以激活金属-有机框架中的晶格氧
Tao Zhao1,2, Dazhong Zhong1,2, Qiang Fang1,2
1College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, Shanxi, P.R. China.
ACS applied materials & interfaces
|May 14, 2024
概括
兴奋剂增强了金属有机框架 (MOFs) 以实现高效的水分裂. 这种介导的策略改善了氧-演化和-演化反应的导电性和催化活性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 金属有机框架 (MOFs) 作为电催化剂具有前景,但由于导电性差和协调和而受到影响.
- 开发高效和稳定的电催化剂对于水分技术至关重要.
研究的目的:
- 为了研究阴离子 (V) 修改对铁MOF (CoFe-MOF) 纳米板阵列的电催化性能的影响.
- 评估V-修改MOF作为双功能电催化剂在整体水分化的潜力.
主要方法:
- 在泡 (NF) 上合成V-doped CoFe-MOF纳米板阵列.
- 电化学表征包括氧进化反应 (OER) 和进化反应 (HER) 在性介质中的测量.
- 使用膜电极组件 (MEA) 进行水分性能评估.
- 在现场分析催化剂重建和机械学研究.
主要成果:
- 最佳的V-CoFe-MOF/NF催化剂表现出极好的OER/HER性能 (231 mV在100 mA cm-2/86 mV在10 mA cm-2) 和OER耐用性 (>400小时).
- 双功能分水实现了低电池电压 (1.60V在10 mA cm-2),进一步通过MEA测试验证 (1.53V在10 mA cm-2).
- 兴奋剂诱导了催化剂重建,形成活性β-MOOH物种,并将OER机制转移到晶格氧化氧化机制 (LOM).
结论:
- 阴离子兴奋剂是一种有效的策略,可以增强MOF的导电性和电催化活性.
- 在水分解方面,V-CoFe-MOF/NF具有卓越的双功能电催化性能.
- 该研究提供了对MOF催化剂设计和能源应用机制优化的洞察.
相关概念视频
02:51Metal-Ligand Bonds
20.7K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
20.7K
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K
01:19Oxidation and Reduction of Organic Molecules
6.5K
Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
The removal of an electron from a molecule, results in a...
6.5K